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United States Patent | 5,028,317 |
Lyman | July 2, 1991 |
The density of the material in the jig bed is measured in consecutive short segments over the jig cycle, the time period of each segment being not greater than one-tenth the cycle time of the jig, to determine the density signature or profile of the jig. By controlling the operating parameters (e.g. inlet and outlet valve opening and closing, underbed flow rate, discharge gate position and jig working air pressure) of the jig, the density signature or profile is maintained within a control envelope for efficient stratification of the mineral.
Inventors: | Lyman; Geoffrey J. (Yeronga, AU) |
Assignee: | University of Queensland (St. Lucia, AU) |
Appl. No.: | 294511 |
Filed: | December 22, 1988 |
PCT Filed: | June 29, 1987 |
PCT NO: | PCT/AU87/00185 |
371 Date: | December 22, 1988 |
102(e) Date: | December 22, 1988 |
PCT PUB.NO.: | WO88/00095 |
PCT PUB. Date: | January 14, 1988 |
Jun 27, 1986[AU] | PH6612 |
Current U.S. Class: | 209/457; 209/489; 209/491; 209/496 |
Intern'l Class: | B03B 005/24 |
Field of Search: | 209/455,457,456,489,490,491,496,500 |
3082873 | Mar., 1963 | Bartelt | 209/491. |
4176749 | Dec., 1979 | Wallace et al. | 209/457. |
4265744 | May., 1981 | Weiffen | 209/457. |
4342654 | Aug., 1982 | Lambert | 209/457. |
Foreign Patent Documents | |||
1115651 | Oct., 1961 | DE. | |
1217292 | May., 1966 | DE. | |
1245281 | Jul., 1967 | DE. | |
2822979 | Nov., 1979 | DE. | |
3106114 | Sep., 1981 | DE. | |
928665 | Dec., 1947 | FR. | |
2075867 | Nov., 1981 | GB | 209/456. |
2131182 | Jun., 1984 | GB. |
Derwent Abstract Accession No. 84-242854/39, Class P41, SU, A, 1072-906 (Kazapoly), Feb. 15, 1984. Bartelt, Dietrich, "Regulating Jig Discharge by Means of Radio-Isotopes", 4th Intl. Coal Preparation Congress, 1962, Papger B-2, pp. 89-97, (See pp. 94, 95-FIG. 7). Wills, B. A., Mineral Processing Technology, "An Introduction to the Practical Aspects of Ore Treatment and Mineral Recovery", pp. 224-235, Pergamon Press, 1981. Gaudin, A. M., Principles of Mineral Dressing, Chapter XII, pp. 250-259, McGraw-Hill Book Company, Inc., 1939. Dept. of Chemical Engineering, Oregon State University, Chemical Reaction Engineering, Ch. 9, pp. 254-259, xix, John Wiley & Sons, 2nd Edition, 1972. |